I don't know if this is exactly what you are looking for, but here's a link that might be of help:
http://www.fibergypsy.com/common/children.shtml
ETA: you might want to check these against Burda, or another pattern that fits decently. Oh, and if you do have a Burda kids pattern, or get one soon, there is a sizing chart on each pattern, inside on the pattern pieces, that goes from newborn to teen age clothing size. I mounted this on a heavier paper, and taped it to my wall, by my sewing machine for reference.